CN107117164B - A kind of stroke-increasing electric automobile APU control method - Google Patents

A kind of stroke-increasing electric automobile APU control method Download PDF

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Publication number
CN107117164B
CN107117164B CN201710187893.9A CN201710187893A CN107117164B CN 107117164 B CN107117164 B CN 107117164B CN 201710187893 A CN201710187893 A CN 201710187893A CN 107117164 B CN107117164 B CN 107117164B
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power
increasing unit
distance increasing
vehicle
battery
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CN107117164A (en
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余世明
张申盖
何德峰
宋秀兰
徐东伟
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/244—Charge state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The invention discloses the control methods of stroke-increasing electric automobile APU a kind of.Stroke-increasing electric automobile provides the driving force of vehicle driving, and two sources of the dynamic battery of electric energy needed for motor and distance increasing unit by driving motor.The distance increasing unit power as provisioned in stroke-increasing electric automobile is smaller, it is not able to satisfy the dynamic property requirement of vehicle in the CS stage of vehicle driving, therefore the present invention starts distance increasing unit by the CD stage in vehicle driving and works in the operating point of setting, has achieved the purpose that reduce battery maximum discharge current and has extended CD stage operating range.The follower method to request power is used in the CS stage, and it is by being realized in high efficient area using " fixed point+segmentation fixed rotating speed adjusts torque " that the power of distance increasing unit, which follows, avoid the engine operation low power section very low in efficiency, it also avoids engine speed to change with the frequent change of request power, is conducive to the efficiency and noise that improve type range extender engine.

Description

A kind of stroke-increasing electric automobile APU control method
Technical field
The present invention is applied to a kind of electric car for being equipped with small-power distance increasing unit, mainly for VMT Vehicle-Miles of Travel beyond pure The case where electric continual mileage.
Background technique
Currently, the development of pure electric automobile receives the restriction for the problems such as continual mileage is short, and battery is at high cost, if battery Technology cannot be broken through, then these restrictions also hardly result in solution.Stroke-increasing electric automobile currently solves these problems A kind of transition scheme, it is that a distance increasing unit is increased on the basis of pure electric automobile, logical after battery power consumption is complete It crosses the power generation of starting distance increasing unit to provide power to vehicle, achievees the purpose that extending driving range.
When predicted travel mileage is more than pure electric continual mileage, the whole driving process of stroke-increasing electric automobile can be divided into Two stages: CD stage (electric quantity consumption) and CS stage (electricity maintenance), to the common stroke-increasing electric automobile control of CD-CS mode Method processed has thermostat approach and best fuel oil curve power follower method.
Although thermostat approach can guarantee that type range extender engine always works in most after vehicle driving enters the CS stage Advantage, but it is in charging and discharging state always into power battery after the CS stage, it is unfavorable for the service life of battery.
Best fuel oil curve power is followed can be realized and be followed in CS stage distance increasing unit to request power, is advantageously reduced The frequent charge and discharge number of battery, but since economic performance is poor when low power section works for type range extender engine, this is just The whole fuel-economy performance for resulting in best fuel oil curve power follower method is undesirable, if adding vehicle driving-cycle The frequent change complicated and changeable that will also result in type range extender engine operating point, these are all unfavorable to engine.It is finally bright It is that, since the distance increasing unit power that vehicle is equipped with is smaller, after vehicle driving enters the CS stage, distance increasing unit is not able to satisfy vehicle Power performance requirement, be merely capable of maintain vehicle continue to travel with certain speed.
For the deficiency of existing control method, the present invention provides a kind of extended-ranges for being suitable for being equipped with small-power distance increasing unit The control method of electric car, this method can extend operating range of vehicle under the conditions of meeting power performance, combine The service life and fuel-economy performance of battery.
Summary of the invention
Technical solution are as follows: whole driving process is divided into two stages of CD and CS, but the two stages are controlled respectively System, specific as follows:
CD stage control:
1, starting distance increasing unit and work when the request power of driving motor is greater than the 80% of power battery maximum discharge power Make in PmaxPoint, starting distance increasing unit at this time is to need power to be offered to share Partial Power request to reduce power battery Value reduces the use longevity for requiring the discharge-rate of battery and being conducive to battery to reduce the maximum discharge-rate of battery Life.
2, also start distance increasing unit when speed of operation is greater than certain fixed speed of setting and work in best fuel oil PbestPoint, Starting distance increasing unit is used to reduce consumption of the vehicle driving to battery at this time, reduces the speed of battery SOC decline, extends SOC decline To lower limit value SOCminWhen vehicle driving distance, to extend the distance that vehicle is travelled with full dynamic property.
CS stage control:
1, schemed first according to the Map of engine, determine revolving speed power choosing the fixed operating point of minimum power above and being segmented Follow region.
2, increasing journey is not started when the CS stage is when the fixed operating point of the minimum for requesting power to be chosen in step 1 less than us Device is operated alone by battery；When the fixed operating point of minimum power that request power is greater than setting and revolving speed power is determined less than segmentation When the power of the minimum piecewise interval followed, distance increasing unit starts and the minimum power operating point selected in step 1 that works.
3, when requesting power to be located at the piecewise interval of setting, distance increasing unit starting is simultaneously followed to requesting power to carry out power.
Detailed description of the invention
Fig. 1 is that figure is chosen in CD stage type range extender engine operating point；
Fig. 2 is CD stage control flow chart；
Fig. 3 is the type range extender engine work point diagram of CS phase sets；
Fig. 4 is CS stage distance increasing unit control method flow chart.
Specific embodiment
Specific implementation of the invention is as follows:
This operating range (according to navigation) is estimated first before vehicle driving, if distance is less than the driving of vehicle pure electric vehicle Mileage does not start distance increasing unit then.If predicted travel mileage is greater than pure electric continual mileage, designed according to this invention control method Vehicle energy system is controlled.
The specific implementation of the invention for the CD stage mainly comprises the steps that
1, the high efficient area selection as shown in Figure 1, according to the practical type range extender engine being equipped with of vehicle, in its Map figure Two fixed operating point PmaxAnd Pbest, wherein PmaxFor the peak power output operating point in engine high-efficiency rate area, PbestFor hair Best efficiency point in the entire working region of motivation.
2, it starts running, detects the SOC of battery, first if more than SOCtargetThen explanation is currently at the CD stage.Wherein SOCtargetFor the demarcation threshold in vehicle driving CD and CS stage, it is set as 0.4 for the present invention, because of battery after SOC < 0.4 Discharge power will sharply decline.The different automobile types threshold value will be determined according to practical calibration.
3, current actual vehicle speed V is obtained in real timevehicle, and current vehicle traveling is obtained according to driver's output signal Request power Preq。
5, whether the vehicle request power for judging that step 3 obtains is greater than the 80% of the battery maximum discharge power that we set (0.8*Pbattery_dis_max), wherein Pbattery_dis_maxFor the maximum discharge power of battery, i.e. Preq>0.8*Pbattery_dis_max。 If so, then start distance increasing unit and allows type range extender engine work in preset PmaxPoint.
6, judge whether the actual vehicle speed of step 3 acquisition is greater than the vehicle speed value V of settingconstant, i.e. VvehicleWhether > Vset It sets up, wherein Vset is preset value, depending on which specifically demarcates according to different automobile types and driving cycle, institute of the present invention Test vehicle is set as Vset=40km/h.If so, then starting distance increasing unit makes engine operation in preset PbestPoint.
If the 7, P in step 5req>0.8*Pbattery_dis_maxWith the V in step 6vehicle> Vset is invalid, then does not open Dynamic distance increasing unit, is operated alone vehicle driving by power battery.
The specific implementation of the invention for the CS stage mainly comprises the steps that
1, as shown in figure 3, according to the practical type range extender engine being equipped with of vehicle, a least work is set on its Map figure Rate fixes operating point PminSegmentation P is followed with four power1-1’、P2-2’、P3-3’、P4-4', the sets requirement of 4 segmentations can be covered Lid engine is greater than PminEntire power bracket, and in order to avoid request power just segmentation intersection frequently change, each Being segmented junction, there are laps.
2, each segmentation in step 1 is worked respectively in fixed rotating speed X1、X2、X3、X4, realized pair by adjusting torque Each segmented power follows.
3, after vehicle driving enters the CS stage, request power is first calculated according to the output signal and current vehicle speed of driver Preq。
4, judgement request power PreqWith the preset engine minimum startup power P of step 1minSize relation, if Preq< PminDo not start engine then；If Pmin<PReq<P1-1' then start distance increasing unit, and allow engine operation in PminPoint.
If 5, PReq∈P1-1', then start distance increasing unit, and allow engine operation fixed rotating speed be X1, to request power It is followed.
If 6, PReq∈P2-2', then start distance increasing unit, and allow engine operation fixed rotating speed be X2, to request power It is followed.
If 7, PReq∈P3-3', then start distance increasing unit, and allow engine operation fixed rotating speed be X3, to request power It is followed.
If 8, PReq∈P4-4', then start distance increasing unit, and allow engine operation fixed rotating speed be X4, to request power It is followed.
If 9, PReqGreater than engine power ranges P4-4' maximum power that can be output, and SOC > SOC of batterymin, Middle SOCminThe minimum SOC value that can be discharged for battery.Then distance increasing unit and battery provide electric energy, engine operation jointly for motor In P4-4' in peak power output at, battery provides insufficient power.
If 10, PReqGreater than engine power ranges P4-4' maximum power that can be output, and SOC < SOC of batteryminWhen, It can be unfavorable to the service life after the use of battery if battery continues electric discharge.In this case, distance increasing unit operates in P4-4' in maximum output Motor is operated alone in power points, is insufficient for the request power of vehicle, can only sacrifice the power performance of vehicle.

Claims (2)

1. a kind of stroke-increasing electric automobile distance increasing unit control method, the described method comprises the following steps:
(1) SOC value of battery is obtained, judges that vehicle is currently at CD stage or CS stage；
(2) if vehicle is in the CD stage, current vehicle speed and current request power is obtained and determines opening for distance increasing unit according to them Pass and operating point；
(3) if vehicle is in the CS stage, according to the switch of SOC value of battery and vehicle request power selection distance increasing unit, work Mode and operating point；
When vehicle driving is in the CD stage, according to the specific of current vehicle speed and request power decision distance increasing unit start and stop and specific works point Step are as follows:
(1) if request power is greater than the set value, start distance increasing unit and work in fixed maximum power point；
(2) if current vehicle speed is greater than the set value, start distance increasing unit and work in peak efficiency fixed point；
(3) if the above two o'clock is all invalid, distance increasing unit is in close state, and vehicle driving is operated alone by power battery.
2. a kind of stroke-increasing electric automobile distance increasing unit control method according to claim 1, which is characterized in that when vehicle row It sails in the CS stage, according to the tool of SOC value of battery and vehicle driving request power decision distance increasing unit switch, working method and operating point Body step are as follows:
(1) if request power is less than the engine minimum operating power point of setting, do not start distance increasing unit；
(2) if request power is greater than the engine minimum operating power point of setting but is less than the value for the minimal segment that segmented power follows When, start distance increasing unit and works in minimum power point；
(3) if the distance increasing unit power that request power is located at setting follows in segmentation, start distance increasing unit and according to request power Value allows distance increasing unit to switch between being set in each segmentation and follows；
(4) if request power is greater than maximum power segmentation and can be provided power, and when battery SOC is greater than electric discharge lower limit value, increase journey In maximum power point, battery provides remaining insufficient power for device work；
(5) if request power is greater than maximum power segmentation and can be provided power, and when battery SOC is less than electric discharge lower limit value, battery It does not discharge, distance increasing unit work is operated alone in maximum power point, and vehicle can only be travelled with limited power.
CN201710187893.9A 2017-03-27 2017-03-27 A kind of stroke-increasing electric automobile APU control method Active CN107117164B (en)

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CN108995642B (en) * 2018-07-18 2020-08-14 浙江吉利新能源商用车有限公司 Vehicle range extender control method and system and vehicle
CN109795475B (en) * 2019-01-21 2021-04-27 东风航盛（武汉）汽车控制***有限公司 Range-extending hybrid power control method
CN110550018B (en) * 2019-09-05 2021-06-08 武汉理工大学 Energy management method of extended range hybrid electric vehicle
CN112319248B (en) * 2020-11-17 2022-04-26 睿驰电装(大连)电动***有限公司 Method and device for controlling starting of engine of extended range electric vehicle
CN112477633B (en) * 2020-12-02 2022-02-01 浙江吉利控股集团有限公司 Multipoint control method and control system for range-extended electric vehicle
CN112606736B (en) * 2021-01-05 2022-07-22 南昌智能新能源汽车研究院 Range extender control method and range-extending electric automobile
CN113682295B (en) * 2021-08-25 2024-04-09 一汽解放汽车有限公司 Automobile energy distribution optimization method and combined power range-extending automobile

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